Adaptive mask boundary correction in a cone beam imaging system

Details Adaptive mask boundary correction in a cone beam imaging system Adaptive mask boundary correction in a cone beam imaging system

1998-09-28

2000-07-04

Bruce, David V.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 8, 378901, A61B 603

Patent

active

060849371

ABSTRACT:
A method and apparatus for three dimensional (3D) computerized tomographic (CT) imaging of a region-of-interest (ROI) in an object, wherein image reconstruction processing is applied to a plurality of sets of 2D cone beam projection data, each set being acquired on a 2D detector at a corresponding plurality of scan path source positions. A first image reconstruction processing step comprises applying a mask to each set of the projection data so that data inside the boundaries of each mask form a corresponding plurality of masked 2D data sets. Next, the data inside each masked 2D data set is filtered along a plurality of parallel lines formed therein, to generate a corresponding plurality of filtered 2D data sets. Each filtered 2D data set corresponds to a calculation of a first estimate of Radon derivative data determined from a given set of the 2D cone beam projection data. The next step comprises adaptively developing 2D correction data for each of the first estimates of Radon derivative data. The final step comprises combining each filtered 2D data set and the adaptively determined 2D correction data calculated therefore, in a weighted 3D backprojection manner into a 3D space, thereby reconstructing a 3D image of the ROI in the object.

REFERENCES:
patent: 5390111 (1995-02-01), Tam
patent: 5390226 (1995-02-01), Tam
patent: 5504792 (1996-04-01), Tam
patent: 5878103 (1999-03-01), Sauer et al.
patent: 6018561 (2000-01-01), Tam

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